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Aerostar 16x28x4 Collapsible Replacement Air Filter for Aprilaire 413 Air System – Factory Direct Filters
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Aerostar MERV 13 Collapsible Replacement Filter for Aprilaire 413, 4PK: Amazon.com: Tools & Home Improvement
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HDX FPR 9 Expandable Air Filter 16x28x4 - Fits Aprilaire Space-Gard - Open Box | eBay
16x28x4 Odor Eliminator Air Filters - Only $47.62/ea.
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Bestair Pro 16x28x4 Synthetic Furnace Air Cleaner Filter, MERV 11 2 PK SG411-PR-BOX | Zoro
2 Pack Riverline Filter Replacement for AprilAire 416, Whole House Air Purifiers - MERV 16, 16x28x4 Air Filter - Amazon.com
16" x 28" x 4" MERV 8 Air Filters - Only $43.54 Each!
HDX 16 in. x 28 in. x 4 in. AprilAire/Space-Guard Replacement Pleated Air Filter FPR 9, MERV 11 HDX-AXP-413-2 - The Home Depot
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BestAir 16 In. x 28 In. x 4 In. Aprilaire & SpaceGard MERV 13 Deep Pleat Expandable Furnace Filter - Kellogg Supply
Carrier 16X25 MERV 13 – BestAir Furnace Filters, Humidifier Filters & Wicks and Compactor Trash Bags – Made in USA